ELFT HÍRADÓ

[Janos Asboth <asboth.janos AT ttk.bme.hu>]

Meghívó

BME Elméleti Fizika Szeminárium,

jún. 12. szerda (!) 10h15,

1111 Budapest, Budafoki út 8., BME F III. magasföldszint 01.,
Elméleti Fizika Tanszék szemináriumi szoba

Leonce Dupays (Dept Phys and Materials Science, Uni Luxembourg -- visiting
Dóra Balázs)
Fast control of many-body quantum systems

Controlling many-body quantum systems is at the forefront of the
development of quantum technologies. To bypass the adiabatic preparation of
quantum states, techniques known as shortcuts to adiabaticity (STA) have
been developed [1]. In this talk, we will first discuss the extension of
the technique of delta-kick cooling to many-body systems verifying
scale-invariant dynamics [2]. Delta-kick cooling is commonly used in
ultracold atoms to narrow the momentum distribution of atomic clouds. We
will demonstrate the link between delta-kick cooling and time-optimal
control and present a new type of STA that combines shortcuts and a
delta-kick. Afterwards, we will present some progress in the control of
gapless many-body quantum systems described by the Tomonaga-Luttinger
liquid (TLL). We will provide exact dynamics in the quenched TLL where the
interactions are varied in time. Furthermore, we will characterize the
residual energy after a finite time quench. To cancel the residual energy,
we will propose a STA protocol using counterdiabatic driving [3,4].

[1] D Guéry-Odelin, A Ruschhaupt, A Kiely, E Torrontegui, S
Martínez-Garaot, JG Muga, Rev. Mod. Phys. 91, 045001 –2019
[2] L. Dupays, D. C. Spierings, A. M. Steinberg, A. del Campo, Phys Rev
Research, 2021
[3] L. Dupays, B. Dóra, A. del Campo, arXiv preprint, arXiv:2401.17884, 2024
[4] L. Dupays, A. del Campo, arXiv preprint, arXiv:2404.19013, 2024

Minden érdeklődőt szeretettel várunk.
Asbóth János,
 szemináriumi koordinátor